dfh.fm
MR623-ZZ Bearings
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10-pack of MR623-ZZ / 623-ZZ miniature shielded ball bearings for ERCF and small 3D-printer motion assemblies. Each bearing is the compact 3 mm ID × 10 mm OD × 4 mm width size with metal shields on both sides.
Why use MR623-ZZ here
- Metal shielded: ZZ shields help keep dust and printed-plastic debris out while staying lower-drag than contact rubber seals.
- Correct miniature size: 3 × 10 × 4 mm format, also commonly listed as 623-ZZ, 623ZZ, R1030ZZ, or MR623ZZ.
- ERCF context: the ERCF v2 community repo documents a plain 623ZZ bearing encoder option for builders maintaining or adapting v1.1-style kits.
Specifications
- Quantity: 10 bearings
- Bearing type: miniature radial ball bearing
- Size: 3 mm bore / 10 mm outside diameter / 4 mm width
- Shielding: ZZ, metal shields on both sides
- Interchange/search terms: MR623-ZZ, MR623ZZ, 623-ZZ, 623ZZ, R1030ZZ
Fitment and related parts
Useful for ERCF-style filament feeders, encoder mods, and other small printer mechanisms that call for the 3×10×4 mm shielded 623 size. If your build calls for the smaller 5×8×2.5 mm bearing instead, use MR85-ZZ bearings. For the current DFH ERCF kit, see the Enraged Rabbit Carrot Feeder.
Not for
- MR85 / 685-size bearing locations — those are a different size.
- Wet or dirty environments where a rubber-contact 2RS seal is specifically required.
Shipping & Returns
Returns:
Thank you for purchasing from dfh.fm. I want you to be completely satisfied with your purchase. If for any reason you are not satisfied, you may return your purchase within 60 days of the original purchase date.
Defective items: Please inspect items upon receipt. If you receive a defective item, you may return it for a full refund or replacement within 90 days of the original purchase date. Please contact me to initiate a return for a defective item.
Non-defective items: If you are not satisfied with a non-defective item, you may return it for a refund within 30 days of the original purchase date. A 20% restocking fee will be deducted from the refund amount, to offset the time and inconvenience, as I am the sole employee processing the return and restocking the item. The fee also covers the costs associated with processing the return. Refunds for non-defective items will be issued through the original payment method.
Preordered items: Due to the nature of preorders, delivery dates are subject to change. Please keep in mind that, If you have preordered an item, it is not eligible for a refund until after it has arrived at the store. Once the item arrives at the store and is inspected, you may request a refund within 30 days of the original purchase date. Please note that refunds for preordered items may take up to 10 days to be issued.
To initiate a return, please open a ticket on the shop’s discord channel, with your order number and the reason for the return. We will provide you with further instructions on how to return your purchase.
Thank you for shopping with us. If you have any questions or concerns, please don't hesitate to contact me, via Discord.
Order alterations and cancellations:
Once an order has ben submitted, no alterations can be made. This includes adding or removing items or canceling orders. You are welcome to return an order, once you have taken receipt, following the returns procedure listed above.
Shipping:
US Shipping is via UPS or USPS. The way it is set up shows the least expensive options for standard, priority and express shipping. I can not take special requests for specific carriers at this time.
International shipping is mostly UPS, as I utilize Zonos/UPS integration to tally extremely accurate import and shipping costs.
I require a telephone and email with international orders and you must make yourself available to the carrier or your customs, should they require more information. If you are unreachable and the package is discarded or rerturned, I will not be responsible for rerturning your shipping cost.
If there is a problem with an international order, it is my choice to refund part or all of the order, or send a replacement.
Addresses are verified through Shopify, but the customer is still responsible for inputting their address in the correct format. Any returns or lost shipments, due to incorrectly addressed packages, are the responsibility of the customer.
